/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/MeshConstraintsUtil.h
Create polycurve projection targets at group boundaries. Vertices on multiple boundaries are fixed, as well as vertices at boundary "corners" (where the angle formed between adjacent boundary edges is above a given threshold.)
static void SetBoundaryConstraintsWithProjection ( [FMeshConstraints](API\Plugins\DynamicMesh\FMeshConstraints) & Constraints, const [EBoundaryType](API\Plugins\DynamicMesh\FMeshConstraintsUtil\EBoundaryType) BoundaryToConstrain, const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, double CornerAngleThreshold )